Cylinder-lock.



'E. EPSTEINQ Y QYLINDER LOCK..

APPLICATION FILED NOV. 5. 1914.

Patented Apr; 20', 1915.

and has for its object to provlde a novel conmasses.

T all whom it may concern:

Be it known that I, ELI- EPSTEIN, a subject of the Czar of Russia,residing, at Boston, county of .Sufiolk, State of Massachusetts, haveinvented an Improvement in Cylinder-Locks, of which thefollowingdescription, in connection with the accompanying drawing, is aspecification, like characters on the drawing representing like parts.

This invention relates to cylinder locks struction by which thecylinderis locked into the barrelin such a way'that it cannot be removed afterthe parts are once assembled withoutfdestroying the lock. In thecylinder look as usually madetheh cylinder can be removed from thebarrel comparatively easily aftetr the multi-par't tumbler pins havebeen lined'np, a'ndan expert locksmith can readily line up the tumblerpinseven though he has not a key by giving the lock jarring blows. Thisfact opens the way for unauthorized persons to secure improperly a du-'plicate key of the lock, for the making of the duplicatekey' involvessimply removlng the cylinder from the lock andthen filing a key to fitthe tumblersof the lock, after which the cylinder can be placed back inthe look.

again. My invention obviates the possibility of this being done-byproviding a construction which prevents the cylinder from being removedfrom the barrel after the parts haveonce been assembled. With myimprovements it is impossible for any person to make a duplicate keyexcept/from the original key. The construction also has the advantagethat it renders the lock non-pickable. r

In order to'give anunderstanding of my invention T have illustrated inthe drawings a selected embodiment thereof which will now be described,after which the novel. features will be pointed. out in the appendedclaim. g v

Figural is a vertical sectional view ofa duplex cylinder lock "onsubstantially the line a;-m, Fig; 2; Fig. 2 is a sectional View on theline y-' y, Fig. 1; Fig. 3 is a perspective view of the cylinderremoved; Fig. 4 is a perspective view of the locking ring.

The lock herein shown comprises the usual casing or barrel 1 having abore to receive the cylinder 2 which is provided with the usual key slot3. 9

4: represents the usual rnnlti-part tumbler pins which are received inapertures formed Specification of Letters Patent. Patented Apr. 2t),-1915. Application filed November 5, 1914. Serial No. 870,337.

in the barrel and cylinder, respectively, said pins being acted uponbysprings 6. The parts thus far described are such as r are commonly foundin cylinder locks and form no part'of my present invention.

In order to lock thecylinder in the barrel so as to prevent thepossibility of its being removed under any circumstances, I have. hereinprov1ded the cylinder with a groove 7' and have provided the bore in thebarrel with a mating groove 8, and have also provided a split lockingring 9 which is adapted to be received in said grooves thereby to lockthe cylinder in the barrel. The groove is deep enough and the lockingring 9 is a spring ring so that in assembling the parts the ring 9 canbe placed into the groove 7 and then compressed to permit the cylinderto be inserted into the barrel. When the cylinder is in place the groove7 is opposite the groove 8 and the resiliency of the ring 9 will causeit to spring out into the groove 8 so that the ring will be normallysituated partly in the groove 8 and partly in the groove 7. Bythis meansthe cylinder is positively locked in the barrel and cannot be removedtherefrom. This locking means is independent from the tumbler pins 4 sothat even when the tumbler pins are lined up the cylinder is stilllocked in the barrel. The gap or opening 10 in the sp'litring 9 is ofsu-fiicient width to receive'the key 11, and in assembling the parts itis essential that the ring 9 should be so positioned that the space .10will come in alinement with the key slot.

This is necessary in order to permit the key to be inserted into theslot in order that the locking ring 9 may not .form an obstruction tothe entrance of the key into the cylinder 3. When the key is insertedand the cylinder is turned by the-,key,the engagement of the back of thekey with the ends of the ring 9 will turn the ring with the cylinder,and as the key cannot be withdrawn except when it is in theposition'shown in Fig. 2, it will be obvious that whenever the key isremoved.

from the lock the locking ring 9 will always be left with the gap orspace 10 therein in alinement with the key slot.

' With my invention it is impossible for any person to remove thecylinder from the lock for the purpose of making a key to fit thecylinder or for any other purpose. The lock will thus be of use only solong as the original keys are available and when these have become lostor broken a new look will be wmed: w t z key fslot grpoye 'tlir iement'wflth'jthe lock byginserting a linloeked position as they In-fsl'cylinde 1oek;-tbeeombinatioe with a bail-rel havipg e nulangtooveintermediate ofits'ends, of a s 3 I I Witnessesf; and a peripheralgroovein said cylindery operetingf in said bore and pro 10 re'ipreyidedwith an 211 b0pe, tumb1er pins carried by the cylinder 5 locking ringreceived in said grooves 'and leckim the eylinder in 'pesitioh, thespace or gap between tlieends 0f the split ring being in alinement withthe key slot of the cylinder. 20

,ELI EPSTEIN.

H LOUIS GSA/Lint, v

THOMAS JJD UMM ND.

In testimony whereof, .I haye slgned my s name to this specifieation, inthe presence of -.'two' subscribing witnesses.

